Thiocarbonyl allophanate derivatives used as lubricants

ABSTRACT

The instant invention relates to novel compounds of formula (II) ##STR1## wherein R, R 2  and x are as defined in the Specification. These compounds retard oxidation of, confer protection under extreme pressures to and reduce frictional wear of lubricants and hydraulic fluids.

This application is a continuation of application Ser. No. 08/179,790, filed Jan 11, 1994 now abandoned, which is a divisional of Ser. No. 08/024,926, filed Feb. 26, 1993 now U.S. Pat. No. 5,300,243, which is a continution of Ser. No. 07/781,790, filed Oct. 23, 1991, now abandoned, which is a divisional of Ser. No. 07/454,323, filed Dec. 21, 1989 which is now U.S. Pat. No. 5,084,195.

BACKGROUND OF THE INVENTION

The present invention relates to novel compositions comprising a lubricant or a hydraulic fluid, and at least one compound which acts as wear protection for metal components subject to frictional wear and as an antioxidant in lubricants. The present invention also relates to novel compounds and to the use of the compositions and novel compounds.

It is known to provide lubricants, for example lubricating oils on a mineral and/or synthetic basis, with additives which act, for example, as wear protection for metal components and are thus capable of reducing the wear on metal components subject to frictional wear. It is also known to add antioxidants to the lubricants, in order to improve the stability and activity or to preserve these over prolonged periods.

It is also known, for example from WO 87/02,358, that phosphorus-containing compounds cannot be used without reservations as lubricating oil additives in lubricating oils for internal combustion engines which are fitted with a catalytic exhaust gas purification system. It is suspected that phosphorus-containing compounds deactivate the catalyst (cf. H. S. Gandhi et al., Applied Catalysis 3, (1982), 79-88).

In WO 87/02,358, thiadiazoles and salts thereof are described as lubricant additives which do not contain any phosphorus and with which, therefore, the adverse aspects described do not arise.

U.S. Pat. No. 4,659,853 has disclosed derivatives of isothiocyanates, without their use being explained in greater detail.

With a view to reduced combustion chamber deposits, more stringent demands are nowadays also made with respect to a low ash content of the lubricant additives.

It is the object of the present invention to provide lubricant compositions which contain additives which protect the metal components from extreme pressures and frictional wear, i.e. which represent a wear protection, and which protect the lubricant from oxidative degradation, without the lubricant additive exerting, for example, harmful effects on a catalytic exhaust gas purification system.

DETAILED DESCRIPTION OF THE INVENTION

According to the invention, this is achieved by a composition comprising

a) a lubricant or a hydraulic fluid and

b) at least one compound of the general formula I ##STR2##

in which x=1 or 2 and,

if x=1,

R is as defined for R¹ or R³ --O-- or,

if x=2,

R is as defined for R⁸, and

R¹ and R³ are alkyl having 1 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ring C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₅ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, alkenyl having 2 to 18 C atoms, phenyl, naphthyl, C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl, or

R¹ and R³ are alkyl having 1 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ring C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₅ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, alkenyl having 2 to 18 C atoms, phenyl, naphthyl, C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl, each of which are monosubstituted or polysubstituted by groups from the series comprising halogen, cyano, nitro, --OR^(a) or --COOR^(b), or

R¹ and R³ are alkyl having 2 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 3 to 10 ring C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₃ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, alkenyl having 3 to 18 C atoms, C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl, each of which are interrupted by one or more groups from the series comprising --O--, --S--, --NH--, ##STR3## C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl being interrupted only in the alkyl radicals, or

R¹ and R³ are alkyl having 2 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 3 to 10 ring C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₃ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, alkenyl having 3 to 18 C atoms, C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl, each of which are monosubstituted or polysubstituted by groups from the series comprising halogen, cyano, nitro, --OR^(a) or --COOR^(b) and are each interrupted by one or more groups from the series comprising --O--, --S--, --NH--, ##STR4## C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl being interrupted only in the alkyl radicals, R^(a) being as defined for R³ with the exception of --OR^(a) and

R^(b) being as defined for R⁶, and

R² is --NR⁴ R⁵, --OR⁶ or --SR⁷, and

R⁴ and R⁵ are identical or different and are --H, alkyl having 1 to 23 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ring C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₅ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, phenyl, naphthyl, C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl, or

R⁴ and R⁵, together with the N atom linking them, form a piperidine, morpholine, hexamethylenimine (perhydroazepine), pyrrolidine, piperazine or 1-methylpiperazine radical, and

R⁶ and R⁷ are alkyl having 1 to 18 C atoms or alkyl having 2 to 20 C atoms which is interrupted by one or more groups from the series comprising --O--, --S--, --NH--, ##STR5## or an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ring C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₅ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, an unsubstituted or C₁ -C₈ alkyl-substituted C₃ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group which is interrupted by one or more groups from the series comprising --O--, --S--, --NH--, ##STR6## or phenyl, naphthyl, C₇ -C₁₈ alkaryl or C₇ -C₁₈ aralkyl, and R⁸ is alkylene having 1 to 18 C atoms, alkylene having 2 to 18 C atoms and interrupted by at least one --O-- group, alkylidene having 2 to 20 C atoms or alkylidene having 3 to 20 C atoms and interrupted by at least one --O-- group.

R¹ and R³ can, for example, be alkyl having 1 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ring C atoms, alkenyl having 2 to 18 C atoms, phenyl, naphthyl, C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl, each of which are mono-, di- or tri-substituted, preferably monosubstituted, by a group from the series comprising halogen, cyano, nitro, --OR^(a) or --COOR^(b), or

R¹ and R³ can, for example, be alkyl having 2 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ring C atoms, alkenyl having 3 to 18 C atoms, C₈ -C₁₈ aralkyl or C₈ -C₁₈ alkaryl, each of which are interrupted by one, two or three, preferably one, group from the series comprising --O--, --S--, --NH--, ##STR7## C₈ -C₁₈ aralkyl or C₈ -C₁₈ alkaryl being interrupted only in the alkyl radicals, or

R¹ and R³ can, for example, be alkyl having 2 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ring C atoms, alkenyl having 3 to 18 C atoms, C₈ -C₁₈ aralkyl or C₈ -C₁₈ alkaryl, each of which are mono-, di- or tri-substituted, preferably monosubstituted, by a group from the series comprising halogen, cyano, nitro, --OR^(a) or --COOR^(b) and are each interrupted by one, two or three, preferably one, group from the series comprising --O--, --S--, --NH--, ##STR8## C₈ -C₁₈ aralkyl or C₈ -C₁₈ alkaryl being interrupted only in the alkyl radicals, with R^(a) and R^(b) being as defined, and

R⁶ and R⁷ can, for example, be alkyl having 2 to 20 C atoms and interrupted by one, two or three, preferably one, group from the series comprising --O--, --S--, --NH--, ##STR9##

R⁸ can, for example, be alkylene having 1 to 18 C atoms and interrupted by one --O-- group, or alkylidene having 3 to 20 C atoms and interrupted by one --O-- group.

Advantageous compositions contain at least one compound of the general formula I, in which R¹ and R³ are alkyl having 1 to 18 C atoms, cycloalkyl having 5 to 8 ring C atoms, phenyl or C₇ -C₁₈ aralkyl, R⁴ and R⁵ are identical or different and are --H, alkyl having 1 to 18 C atoms, cycloalkyl having 5-12 ring C atoms or phenyl, and R⁶ and R⁷ are alkyl having 1 to 18 C atoms, a cycloalkyl group having 5 to 8 ring C atoms or alkyl having 2 to 20 C atoms and interrupted by one group ##STR10## or phenyl or C₇ -C₁₈ aralkyl, and R⁸ is alkylene having 1 to 18 C atoms or alkylidene having 2 to 20 C atoms.

In an alkyl radical R¹ or R³ having 1 to 25 C atoms, the alkyl group can be straight-chain or branched and can be, for example: methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, t-butyl, pentyl, isopentyl, hexyl, heptyl, 3-heptyl, octyl, 2-ethylhexyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, icosyl, henicosyl, docosyl, 2-ethylbutyl, 1-methylpentyl, 1,3-dimethylbutyl, 1,1,3,3-tetramethylbutyl, 1-methylhexyl, isoheptyl, 1-methylheptyl, 1,1,3-trimethylhexyl, 1,1,3,3-tetramethylhexyl or 1-methyundecyl.

Examples of R⁶ and R⁷ and of advantageous radicals R¹ and R³ are alkyl radicals having 1 to 18 C atoms. Examples can be taken analogously from the above list. Alkyl radicals such as ethyl, n-butyl or heptadecyl are preferred.

Long-chain alkyl radicals can be straight-chain or branched and also mixed-chain radicals, and in particular the branched-chain radicals can also be in the form of mixtures of their isomers.

R¹ and R³ can also be alkenyl having 2 to 18 C atoms. Examples of these are vinyl, allyl, 2-methallyl, butenyl, e.g. 2-butenyl, hexenyl, e.g. 2-hexenyl, decenyl, undecenyl, e.g. 10-undecenyl, heptadecenyl or oleyl.

Examples of the said unsubstituted cycloalkyl groups R¹, R³, R⁶ and R⁷ having 5 to 12 C atoms are cyclopentyl, cyclohexyl, cyclooctyl and cyclododecyl, cyclohexyl being particularly preferred. Examples of C₁ -C₈ alkyl-substituted cycloalkyl groups having 5 to 12 ring C atoms are those which advantageously carry one, two or three alkyl groups having 1 to 8 C atoms in total, and these can be 2- or 4-methylcyclohexyl, dimethylcyclohexyl, trimethylcyclohexyl or t-butylcyclohexyl.

An unsubstituted or C₁ -C₈ alkyl-substituted C₅ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group R¹, R³, R⁶ and R⁷ means, for example, radicals of the general formula ##STR11## r being one of the numbers 0, 1, 2, 3, 4, 5, 6, or 7, s being one of the numbers 1, 2, 3 or 4 and t being one of the numbers 0 or 1 and higher, advantageously 0, 1, 2 or 3, and R₀ being alkyl having 1 to 8 C atoms, preferably methyl, ethyl, propyl, n-butyl or t-butyl.

Radicals of the formulae ##STR12## in which t=0, 1, 2 or 3 and R₀ is methyl or t-butyl and, particularly preferably, R₀ being methyl and t=1, 2 or 3 or R₀ being t-butyl and t=1, or t being 0, are advantageous.

The substituents R₁, R₃, R₆ and R₇ can also be unsubstituted or C₁ -C₈ alkyl-substituted C₃ -C₁₂ cycloalkyl groups which are interrupted by one or more groups from the series comprising --O--, --S--, --NH--, ##STR13##

Those radicals of the general formula ##STR14## are preferred in which r' is one of the numbers 0 or 1 to 9, but advantageously 3.

X can be one of the groups from the series comprising --O--, --S--, --NH--, ##STR15## and preferably is ##STR16## s can be 1, 2, 3 or 4 and is advantageously 1. The definitions of R₀ and t and the preferred definitions are given above.

An interruption in the alkyl group by ##STR17## is particularly preferred. The group of the formula ##STR18## is very particularly preferred.

C₇ -C₁₈ Aralkyl R¹ or R³ can especially be naphthyl-C₁ -C₈ alkyl and in particular phenyl-C₁ -C₈ alkyl, for example benzyl, 2-phenylethyl (dihydrostyryl) or methylbenzyl.

Examples of R¹ and R³ associated with the C₇ -C₁₈ alkaryl radicals include, for example, C₁₁ -C₁₈ alkylnaphthyl and especially C₇ -C₁₈ alkylphenyl, preferably methylphenyl, dimethylphenyl, trimethylphenyl, ethylphenyl, isopropylphenyl, t-butylphenyl, di-t-butylphenyl or 2,6-di-t-butyl-4-methylphenyl.

The substituent R² is, for example, --NR⁴ R⁵, in which R⁴ and R⁵ can be identical or different and preferably are identical.

An alkyl radical R⁴ and R⁵ having 1 to 23 C atoms can, for example, be methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, nonyl, decyl, undecyl, dodecyl, heptadecyl or henicosyl.

Examples of an --NR⁴ R⁵ radical R² are the N-butyl, N-hexyl, N-n-octyl, N-t-octyl, N-t-dodecyl, N-t-tetradecyl, N-t-docosyl, N-methyl-N-octyl, N-methyl-N-dodecyl, N-methyl-N-hexadecyl, N-methyl-N-octadecyl, N,N-di-i-butyl, N,N-di-n-hexyl, N,N-di-t-octyl, N,N-di-2-ethylhexyl, N,N-di-dodecyl, N-methyl-N-phenyl or N-dodecyl-N-phenyl radicals.

Moreover, R⁴ and R⁵ can be C₇ -C₁₈ aralkyl and C₇ -C₁₈ alkaryl. Examples of these are to be found in the lists given above.

In a substituent R² defined as --OR⁶ or --SR⁷, R⁶ and R⁷ are, for example, alkyl having 1 to 18 C atoms. Examples thereof are methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, t-butyl, pentyl, isopentyl, hexyl, heptyl, 3-heptyl, octyl, 2-ethylhexyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, 2-ethylbutyl, 1-methylpentyl, 1,3-dimethylbutyl, 1,1,3,3-tetramethylbutyl, 1-methylhexyl, isoheptyl, 1-methylheptyl, 1,1,3-trimethylhexyl, 1,1,3,3-tetramethylhexyl or 1-methylundecyl.

Preferred examples are methyl, ethyl, n-butyl, n-octyl, i-octyl, 2-ethylhexyl and 1,1,3,3-tetramethylhexyl.

Preferred examples of R⁶ and R⁷, which are alkyl having 2 to 20 C atoms interrupted by one or more groups from the series comprising --O--, --S--, --NH--, ##STR19## include radicals of the formula ##STR20## R⁹ being C₁ -C₁₈ alkyl and preferably C₄ -C₁₂ alkyl.

Suitable examples of C₇ -C₁₈ alkaryl or C₇ -C₁₈ aralkyl R⁶ and R⁷ can be taken from the above list. A benzyl radical is preferred for R⁶ and especially for R⁷.

R⁸ is, inter alia, defined as alkylene having 1 to 18 C atoms, including methylene, ethylene, trimethylene, 2,2-dimethyl-1,3-propanediyl, tetramethylene, pentamethylene, hexamethylene, heptamethylene, octamethylene, decamethylene or dodecamethylene as examples. Trimethylene, tetramethylene, hexamethylene and octamethylene are preferred.

Examples of alkylene R⁸ interrupted by 1 or 2 oxygen atoms are 3-oxapentane-1,5-diyl, 3,6-dioxaoctane-1,8-diyl, 2-oxapropane-1,3-diyl, 2,7-dioxaoctane-1,8-diyl or 2,6-dioxa-4,4-dimethyl-1,7-heptanediyl.

R⁸ can also be alkylidene having 2 to 20 C atoms, examples being ethylidene, propylidene, butylidene, pentylidene, 4-methylpentylidene, heptylidene, nonylidene, tridecylidene, nonadecylidene, 1-methylethylidene and 1-ethylpropylidene.

Examples of C₁ -C₁₈ alkyl and especially C₄ -C₁₂ alkyl R⁹ can be taken analogously from the above list of alkyl radicals.

A further example of a preferred group R¹ is ##STR21## R^(a) being as defined, and ##STR22## is particularly preferred for R¹.

Further advantageous compositions contain a compound of the formula Ia ##STR23##

R¹ and R² being as defined above, or a compound of the formula Ib ##STR24##

R² and R³ being as defined above, or a compound of the formula Ic ##STR25##

R² and R⁸ being as defined above.

The scope of the present invention includes that several compounds of the formula I, respectively Ia, Ib and/or Ic, can also be used in the compositions in any desired mixture with one another.

Particularly advantageous compositions include also those which contain a compound of the formula Ia, in which R¹ is alkyl having 1 to 18 C atoms, phenyl or benzyl and R² is --O--(C₁ -C₁₈)alkyl, --N (C₁ -C₁₈)alkyl!₂, --O--(C₅ -C₁₂)cycloalkyl, --O-phenyl, --O--(C₇ -C₁₈)aralkyl, --S--(C₁ -C₁₂)alkyl,--S-phenyl, --S--(C₇ -C₁₈)aralkyl or --S--CH₂ --COOR⁹, R⁹ being C₁ -C₁₈ alkyl.

Another particularly advantageous composition contains a compound of the formula Ib, in which R² is --O--(C₁ -C₁₈)alkyl, --O--(C₅ -C₁₂)cycloalkyl, --O-phenyl, --O--(C₇ -C₁₈)aralkyl, --S--(C₁ -C₁₂)alkyl, --S-phenyl, --S--(C₇ -C₁₈)aralkyl or --S--CH₂ --COOR⁹, R⁹ being C₁ -C₁₈ alkyl and R³ being C₁ -C₁₈ alkyl, cyclohexyl, phenyl or benzyl.

A further particularly advantageous composition contains a compound of the formula Ic, in which R² is --O--(C₁ -C₁₈)alkyl, --N (C₄ -C₈)alkyl!₂, --O-phenyl, --O--(C₇ -C₁₈)aralkyl, --O--(C₅ -C₁₂)cycloalkyl, --S--(C₁ -C₁₂)alkyl, --S-phenyl, --S--(C₇ -C₁₈)aralkyl or --S--CH₂ --COOR⁹, R⁹ being C₁ -C₁₈ alkyl or C₅ -C₁₂ cycloalkyl and R⁸ being C₁ -C₁₀ alkylene or C₂ -C₁₀ alkylidene.

The preferred compositions also include those which contain a compound of the formula Ia, in which R¹ is alkyl having 9 to 18 C atoms or phenyl and R² is --O--(C₁ -C₈)alkyl, --S--(C₈ -C₁₀)alkyl, --N (C₄ -C₈)alkyl!₂, --S--CH₂ --COO--(C₂ -C₈)alkyl or --S-benzyl, or contain a compound of the formula Ib in which R² is --O--(C₂ -C₈)alkyl, --S--(C₈ -C₁₂)alkyl or --N-- (C₄ -C₈)alkyl!₂ and R³ is C₂ -C₄ alkyl, cyclohexyl or phenyl, or contain a compound of the formula Ic, in which R² is --N (C₄ -C₈)alkyl!₂ and R⁸ is C₃ -C₈ alkylene.

Compositions which are particularly preferred contain a compound of the formula Ia, in which R¹ is phenyl and R² is --SR⁷ or --S--CH₂ --COOR⁹ and R⁷ is C₄ -C₁₂ alkyl and R⁹ is C₄ -C₁₂ alkyl, or contain a compound of the formula Ib, in which R² is --SR⁷ or --S--CH₂ --COOR⁹, R⁷ being C₄ -C₁₂ alkyl and R⁹ being C₄ -C₁₂ alkyl, and R³ is C₁ -C₄ alkyl, cyclohexyl or phenyl, or contain a compound of the formula Ib, in which R² is --S-n-octyl and R³ is ethyl or R² is --S--(2-ethylhexyl) and R³ is n-butyl.

The compounds of the formula I are in some cases known from the literature references cited below, or they can be prepared, for example, by the methods known per se.

Such methods are described in H. Hartmann, I. Reuther, Journal fur praktische Chemie, volume 315, no. 1, 1973, pages 144-148; K. H. Konig, M. Kuge, L. Kaul, M. J. Pletsch, Chemische Berichte 120, pages 1251-1253, (1987), and in E. Schropl, R. Pohloudek-Fabini, Pharmazeutische Zentralhalle, volume 107, (1968), no. 7, pages 493-500.

In analogy to the methods known per se, the following general equations of the process for preparing the compounds of the formulae Ia and Ib can be given: ##STR26##

The equation: ##STR27## applies, for example, to compounds of the formula Ic. The symbols R, R², R⁴, R⁵, R⁶, R⁷ and R⁸ can be as defined above.

The starting materials, for example an acyl chloride, a thiocyanate and the selected amine, the alcohol or the phenol or the mercaptan or thiophenol are reacted, for example in a polar aprotic solvent, at temperatures between about 50° C. and 70° C.

The thiocyanate can also be reacted in a fast process stage with a halogenoformate. Examples of such esters are methyl chloroformate (chloroformic acid methyl ester), ethyl chloroformate, allyl chloroformate, benzyl chloroformate, butyl chloroformate, phenyl chloroformate or vinyl chloroformate.

Suitable acyl chlorides can be devised analogously from the above defintions for R, and examples of these are acetyl chloride, butyryl chloride, oleoyl chloride, 3-phenyl-propionyl chloride and benzoyl chloride or, for R⁸, glutaric acid dichloride, adipic acid dichloride, suberic acid dichloride, sebacic acid dichloride etc.

Ammonium thiocyanate, sodium thiocyanate and preferably potassium thiocyanate can be listed as examples of thiocyanates.

Corresponding to the definitions of R² or R⁴, R⁵, R⁶ and R⁷ respectively, the amines can be, for example, n-butylamine, 2-ethylhexylamine, dihexylamine, bis-(2-ethylhexyl)-amine, methylaniline, piperidine, morpholine, hexamethylenimine (perhydroazepine), pyrrolidine, 1-methylpiperazine and piperazine, examples of alcohols or phenols are ethanol, butanol, iso-butanol, 2-ethylhexanol, cyclohexanol, phenol and 4-methylphenol (p-cresol), and mercaptans or thiophenols are, for example, octylmercaptan, tert-dodecyl-mercaptan, ethyl thioglycolate, 2-ethylhexyl thioglycolate or 3,5-dimethylthiophenol etc.

The listing of starting materials represents examples. The complete starting materials result analogously and correspondingly from all the possible substituents R and R².

The compositions according to the invention contain a lubricant or a hydraulic fluid as a further component. Lubricants are preferred, and the products known per se can be used.

The desired properties of the compounds according to the invention also fully manifest themselves in the hydraulic fluids, although in this case a low level of or freedom from ash and phosphorus is not of such great importance as mentioned above.

The relevant lubricants and hydraulic fluids are known to those skilled in the art and are described, for example, in Dieter Klamann "Schmierstoffe und verwandte Produkte Lubricants and related products!", Verlag Chemic, Weinheim, 1982, in Schewe-Kobek, "Das Schmiermittel-Taschenbuch The Lubricants Handbook!", Dr. Alfred Huthig-Verlag, Heidelberg, 1974, or in "Ullmanns Encyclopadie der technischen Chemic Ullmann's Encylopaedia of Industrial Chemistry!", volume 13, pages 85-94 (Verlag Chemie, Weinheim, 1977).

Examples are lubricants and hydraulic fluids based on mineral oils, synthetic oils or mixtures of mineral and synethetic oils, or synthetic lubricants or hydraulic fluids, for example those which are carboxylic ester derivatives and can be used at temperatures of 200° C. and higher.

Examples of synthetic lubricants also include lubricants based on a diester of a dibasic acid with a monohydric alcohol, for example dioctyl sebacate or dinonyl adipate, a triester of trimethylolpropane with a monobasic acid or with a mixture of such acids, for example trimethylolpropane tripelargonate, trimethylolpropane tricaprylate or mixtures thereof, a tetraester of pentaerythritol with a monobasic acid or with a mixture of such acids, for example pentaerythritol tetracaprylate, or a complex ester of monobasic and dibasic acids with polyhydric alcohols, for example a complex ester of trimethylolpropane with caprylic and sebacic acids or a mixture thereof.

For example poly-α-olefins, ester-based lubricants, phosphates, glycols, polyglycols and polyalkylene glycols and mixtures thereof with water are particularly suitable in addition to mineral oils.

The compounds of the formula I are readily soluble in lubricants and hydraulic fluids and are therefore particularly suitable as additives to lubricants and hydraulic fluids, and their surprisingly good antioxidant action and wear-reducing action are to be emphasized.

For example in lubricants for internal combustion engines, such as internal combustion engines operating on the spark ignition principle, the compounds of the formula I are able to deploy their outstanding properties. Thus, the compounds of the formula I in lubricating oils prevent or reduce the frictional wear of metal components and have an antioxidant action in the lubricating oil, but without adversely affecting a catalytic exhaust gas purification system.

The compounds of the formula I are active even in very small quantities as additives in lubricants and hydraulic fluids. Advantageously, they are admixed to the lubricants and hydraulic fluids in a quantity of 0.01 to 5% by weight, preferably in a quantity of 0.05 to 3% by weight and very particularly preferably in a quantity of 0.1 to 2% by weight, in each case relative to the lubricant or hydraulic fluid.

The lubricants and hydraulic fluids according to the invention can additionally contain other additives, which are added for yet further improvement in the base properties of lubricants and hydraulic fluids; these include: further antioxidants, metal deactivators, rust inhibitors, viscosity index improvers, pour-point depressants, dispersants, detergents, surfactants, further extreme-pressure additives and anti-wear additives.

A number of such compounds is shown by way of example in the list which follows.

Examples of Phenolic Antioxidants

1. Alkylated monophenols

2,6-Di-tert-butylphenol, 2,6-di-tert-butyl-4-methylphenol, 2,6-di-tert-butylphenol, 2-tert-butyl-4,6-dimethylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,6-di-tert-butyl-4-n-butyl-phenol, 2,6-di-tert-butyl-4-iso-butylphenol, 2,6-di-cyclopentyl-4-methylphenol, 2-(α-methylcyclohexyl)-4,6-dimethylphenol, 2,6-di-octadecyl-4-methylphenol, 2,4,6-tri-cyclo-hexylphenol, 2,6-di-tert-butyl-4-methoxymethylphenol and o-tert-butylphenol.

2. Alkylated hydroquinones

2,6-Di-tert-butyl-4-methoxyphenol, 2,5-di-tert-butyl-hydroquinone, 2,5-di-tert-amylhydroquinone and 2,6-diphenyl-4-octadecyloxyphenol.

3. Hydroxylated thiodiphenyl ethers

2,2'-Thio-bis-(6-tert-butyl-4-methylphenol), 2,2'-thio-bis-(4-octylphenol), 4,4'-thio-bis-(6-tert-butyl-3-methylphenol) and 4,4'-thio-bis-(6-tert-butyl-2-methylphenol).

4. Alkylidene-bisphenols

2,2'-Methylene-bis-(6-tert-butyl-4-methylphenol), 2,2'-methylene-bis-(6-tert-butyl-4-ethylphenol), 2,2'-methylene-bis- 4-methyl-6-(α-methylcyclohexyl)-phenol!, 2,2'-methylene-bis-(4-methyl-6-cyclohexylphenol), 2,2'-methylene-bis-(6-nonyl-4-methyl-phenol), 2,2'-methylene-bis-(4,6-di-tert-butylphenol), 2,2'-ethylidene-bis-(4,6-di-tert-butylphenol), 2,2'-ethylidene-bis-(6-tert-butyl-4- or -5-iso-butylphenol), 2,2'-methylene-bis- 6-(α-methylbenzyl)-4-nonylphenol!, 2,2'-methylene-bis- 6-(α,α-di-methylbenzyl)-4-nonylphenol!, 4,4+-methylene-bis-(2,6-di-tert-butylphenol), 4,4'-methylene-bis-(6-tert-butyl-2-methylphenol), 1,1-bis-(5-tert-butyl-4-hydroxy-2-methylphenyl)-butane, 2,6-di-(3-tert-butyl-5-methyl-2-hydroxybenzyl)-4-methylphenol, 1,1,3-tris-(5-tert-butyl-4-hydroxy-2-methylphenyl)-3-n-dodecylmercaptobutane, ethylene glycol bis- 3,3-bis-(3'-tert-butyl-4'-hydroxyphenyl)-butyrate!, bis-(3-tert-butyl-4-hydroxy-5-methylphenyl)-di-cyclopentadiene and bis- 2-(3'-tert-butyl-2'-hydroxy-5'-methyl-benzyl)-6-tert-butyl-4-methyl-phenyl!terephthalate.

5. Benzyl compounds

1,3,5-Tri-(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene, bis-(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide, isooctyl 3,5-di-tert-butyl-4-hydroxybenzyl-mercapto-acetate, bis-(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)dithiol-terephthalate, 1,3,5-tris-(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanurate, 1,3,5-tris-(4-tert-butyl-3-hydroxy-2,6-di-methylbenzyl)isocyanurate, dioctadecyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate and the calcium salt of monoethyl 3,5-di-tert-butyl-4-hydroxybenzylphosphonate.

6. Acylaminophenols Lauric acid 4-hydroxyanilide, stearic acid 4-hydroxyanilide, 2,4-bis-octylmercapto-6-(3,5-di-tert-butyl-4-hydroxyanilino)-s-triazine and octyl N-(3,5-di-tert-butyl-4-hydroxy-phenyl)-carbamate.

7. Esters of β-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionic acid

with monohydric or polyhydric alcohols, for example with methanol, diethylene glycol, octadecanol, triethylene glycol, 1,6-hexanediol, pentaerythritol, neopentyl glycol, tris-hydroxyethyl isocyanurate, thiodiethylene glycol and bis-hydroxyethyl-oxamide.

8. Esters of β-(5-tert-butyl-4-hydroxy-3-methylphenyl)-propionic acid

with monohydric or polyhydric alcohols, for example with methanol, diethylene glycol, octadecanol, triethylene glycol, 1,6-hexanediol, pentaerythritol, neopentyl glycol, tris-hydroxyethyl isocyanurate, thiodiethylene glycol and bis-hydroxyethyl-oxamide.

9. Amides of β-(3,5-di-tert-butyl-4-hydroxyphenyl)-propionic acid

for example N,N'-bis-(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)-hexamethylenediamine, N,N'-bis-(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)-trimethylenediamine and N,N'-bis-(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)-hydrazine.

Examples of Amine-Type Antioxidants

N,N'-Di-isopropyl-p-phenylenediamine, N,N'-di-sec-butyl-p-phenylenediamine, N,N'-bis(1,4-dimethyl-pentyl)-p-phenylenediamine, N,N'-bis(1-ethyl-3-methyl-pentyl)-p-phenylenediamine, N,N'-bis(1-methyl-heptyl)-p-phenylenediamine, N,N'-dicyclo-hexyl-p-phenylenediamine, N,N'-diphenyl-p-phenylenediamine, N,N'-di-(2-naphthyl)-p-phenylenediamine, N-isopropyl-N'-phenyl-p-phenylenediamine, N-(1,3-dimethyl-butyl)-N'-phenyl-p-phenylenediamine, N-(1-methyl-heptyl)-N'-phenyl-p-phenylenediamine, N-cyclohexyl-N'-phenyl-p-phenylenediamine, 4-(p-toluenesulfonamido)-diphenylamine, N,N'-dimethyl-N,N'-di-sec-butyl-p-phenylenediamine, diphenylamine, N-allyldiphenylamine, 4-isopropoxy-diphenylamine, N-phenyl-1-naphthylamine, N-phenyl-2-naphthylamine, octylated diphenylamine, for example p,p'-di-tert-octyldiphenylamine, 4-n-butyl-aminophenol, 4-butyrylaminophenol, 4-nonanoylaminophenol, 4-dodecanoylaminophenol, 4-octadecanoylaminophenol, di-(4-methoxyphenyl)-amine, 2,6-di-tert-butyl-4-dimethylamino-methyl-phenol, 2,4'-di-amino-diphenylmethane, 4,4'-diamino-diphenylmethane, N,N,N',N'-tetramethyl-4,4'-diamino-diphenylmethane, 1,2-di- (2-methyl-phenyl)-amino!-ethane, 1,2-di-(phenylamino)-propane, (o-tolyl)-biguanide, di- 4-(1',3'-dimethyl-butyl)-phenyl!-amine, tert-octylated N-phenyl-1-naphthylamine, a mixture of mono-alkylated and dialkylated tert-butyl-/tert-octyl-diphenylamines, 2,3-dihydro-3,3-dimethyl-4 H-1,4-benzothiazine, phenothiazine and N-allylphenothiazine.

Examples of Further Antioxidants

Aliphatic or aromatic phosphites, esters of thiodipropionic acid or thiodiacetic acid, or salts of dithiocarbamic acid or dithiophosphoric acid.

Examples of Metal Deactivators, for Example for Copper

Triazoles, benzolriazoles and derivatives thereof, tolutriazoles and derivatives thereof, 2-mercaptobenzothiazole, 2-mercaptobenzotriazole, 2,5-dimercaptobenzotriazole, 2,5-di-mercaptobenzothiadiazole, 5,5'-methylenebisbenzotriazole, 4,5,6,7-tetrahydrobenzo-triazole, salicylidene-propylenediamine, salicylaminoguanidine and salts thereof, di-ethanolaminomethyltolyltriazole and di-(2-ethylhexyl)-aminomethyltolyltriazole.

Examples of Rust Inhibitors

a) Organic acids and esters, metals salts and anhydrides thereof, for example: N-oleoyl-sarcosine, sorbitan monooleate, lead naphthenate, alkenylsuccinic anhydride, for example dodecenylsuccinic anhydride, partial esters and amides of alkenylsuccinic acids, and 4-nonylphenoxyoacetic acid.

b) Nitrogen-containing compounds, for example:

I. Primary, secondary or tertiary aliphatic or cycloaliphatic amines and amine salts of organic and inorganic acids, for example oil-soluble alkylammonium carboxylates.

II. Heterocyclic compounds, for example: Substituted imidazolines and oxazolines.

c) Phosphorus-containing compounds, for example: Amine salts of partial esters of phosphoric or phosphonic acids, and zinc dialkyl dithiophosphates.

d) Sulfur-containing compounds, for example: Barium dinonylnaphthalenesulfonates and calcium petroleum-sulfonates.

Examples of Viscosity Index Improvers

Polyacrylates, polymethacrylates, vinylpyrrolidone/methacrylate copolymers, polyvinyl-pyrrolidones, polybutenes, olefin copolymers, styrene/acrylate copolymers and polyethers.

Examples of Pour-Point Depressants

Polymethacrylate and alkylated naphthalene derivatives.

Examples of Dispersants/Surfactants

Polybutenyl-succinamides or succinimides, polybutenylphosphonic acid derivatives and basic magnesium, calcium and barium sulfonates and phenolates.

Examples of Anti-Wear Additives and Extreme-Pressure Additives

Compounds containing sulfur and/or phosphorus and/or halogen, such as sulfurated vegetable oils, zinc dialkyl dithiophosphates, tritolyl phosphate, chlorinated paraffins, alkyl sulfides, aryl disulfides and trisulfides, and triphenyl phosphorothionates.

Some of the compounds which can be used according to the invention are novel. The present invention therefore also relates to novel compounds of the general formula II ##STR28##

in which x=1 or 2,

R² is as defined for --OR⁶ or --SR⁷ and,

if x=1,

R is as defined for R¹ or R³ --O--,

and R¹ is alkyl having 1 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ting C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₅ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, alkenyl having 2 to 18 C atoms, phenyl, naphthyl, C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl, or

R³ is alkyl having 9 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ring C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₅ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, alkenyl having 5 to 18 C atoms, C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl, or

R¹ and R³ are alkyl having 1 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ring C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₅ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, alkenyl having 2 to 18 C atoms, phenyl, naphthyl, C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl, each of which are monosubstituted or polysubstituted by groups from the series comprising halogen, cyano, nitro, --OR^(a) or --COOR^(b), or

R¹ and R³ are alkyl having 2 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 3 to 10 ring C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₃ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, alkenyl having 3 to 18 C atoms, C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl, each of which are interrupted by one or more groups from the series comprising --O--, --S--, --NH--, ##STR29## C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl being interrupted only in the alkyl radicals, or

R¹ and R³ are alkyl having 2 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 3 to 10 ring C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₃ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, alkenyl having 3 to 18 C atoms, C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl, each of which are monosubstituted or polysubstituted by groups from the series comprising halogen, cyano, nitro, --OR^(a) or --COOR^(b) and interrupted by one or more groups from the series comprising --O--, --S--, --NH--, ##STR30## C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl being interrupted only in the alkyl radicals, R^(a) being as defined for R³ with the exception of --OR^(a) and R^(b) being alkyl having 1 to 18 C atoms or alkyl having 2 to 20 C atoms and interrupted by one or more groups from the series comprising --O--, --S--, --NH--, ##STR31## or an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ring C atoms or phenyl, naphthyl, C₇ -C₁₈ alkaryl or C₇ -C₁₈ aralkyl, and R⁶ and R⁷ are alkyl having 11 to 18 C atoms or alkyl having 2 to 20 C atoms and interrupted by one or more groups from the series comprising --O--, --S--, --NH--, ##STR32## or an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ring C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₅ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, an unsubstituted or C₁ -C₈ alkyl-substituted C₃ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group interrupted by one or more groups from the series comprising --O--, --S--, --NH--, ##STR33## , C₇ -C₁₈ alkaryl or C₇ -C₁₈ aralkyl, or,

if x=2,

R is as defined for R⁸ and

R⁸ is alkylene having 1 to 18 C atoms, alkylene having 2 to 18 C atoms and interrupted by at least one --O-- group, alkylidene having 2 to 20 C atoms or alkylidene having 3 to 20 C atoms and interrupted by at least one --O-- group.

In the above definitions, the expressions "one or more groups" or "by at least one group" mean, for example, one, two or three groups, one group being preferred.

For alkyl R³, alkyl groups having 10 to 25 C atoms are advantageous, alkyl groups having 12 to 25 C atoms are preferred and alkyl groups having 15 to 18 C atoms are particularly preferred.

For alkenyl R³, alkenyl groups having 8 to 18 C atoms are advantageous and alkenyl groups having 12 to 18 C atoms are preferred.

For alkyl R⁶, alkyl groups having 12 to 18 C atoms are advantageous and alkyl groups having 15 to 18 C atoms are preferred.

Advantageous compounds are of the formula IIa ##STR34## in which R is as defined for R¹ or R³ --O-- and R¹, R² and R³ are as defined above.

Further advantageous compounds are of the formula IIc ##STR35## in which R² and R⁸ are as defined above.

Preferred compounds are of the formula IIa, in which R is as defined for R¹ or --O--R³ and R¹ is phenyl or alkyl having 1 to 18 C atoms and R³ is alkyl having 1 to 18 C atoms or phenyl, and R² is --SR⁷.

In particularly preferred compounds of the formula IIa, R² is --SR⁷, R⁷ being alkyl having 1 to 18 C atoms, ##STR36## or phenyl-C₁ -C₄ alkyl.

Particularly preferred compounds are of the formulae ##STR37##

The present invention also relates to the use of the compounds of the formulae I and II as anti-wear additives, for example in lubricants, for metal components which are subject to frictional wear, and as antioxidants in lubricants.

The invention is explained in more detail by reference to the examples which follow. All data in percentages or parts are by weight, unless otherwise stated.

EXAMPLE 1 ##STR38##

14.35 g (0.1 mole) of benzoyl chloride are added dropwise in the course of 15 minutes to a solution of 9.9 g (0.1 mole) of potassium thiocyanate in 100 ml of acetone at reflux temperature. After stirring for a further 30 minutes under reflux, 18.9 g (0.1 mole) of dihexylamine are added dropwise under reflux in the course of 20 minutes to the suspension which is now white. After a further 5 hours under reflux, the reaction mixture is poured onto 400 ml of 10% hydrochloric acid and extracted with toluene and ethyl acetate. The organic phase is dried with magnesium sulfate and evaporated. The crude product is eluted through a little silica gel (toluene:ethyl acetate 4:1). After removal of the solvent, this gives 22.3 g of a brown-orange oil (64% of theory).

EXAMPLE 12 ##STR39##

11.1 g (0.07 mole) of phenyl chloroformate are added dropwise in the course of 30 minutes at 50° to a supersaturated solution of 6.9 g (0.07 mole) of potassium thiocyanate in 80 ml of ethyl acetate. The yellow suspension is stirred for a further 90 minutes at 60°. 9.2 g (0.07 mole) of 2-ethyl-1-hexanol are then added dropwise at the same temperature. The mixture is stirred for a further 20 hours at 60°-65°. 40 ml of water are then added, and the emulsion cooled to room temperature is separated in a separating funnel. The organic phase is dried over magnesium sulfate and evaporated. The crude product is eluted over a short silica gel column as described before: yield 12.3 g (57% of theory).

Examples 2 to 11 and 13 to 26 are carried out analogously to Examples 1 and 12, as shown in the Table. The method chosen is indicated in in detail for in each case.

                                                                                      -                                                                               ExampleNo. Compound Methodaccordingto Example Yield(% oftheory)                Appearance                                                                       ##STR40##                                                                       CHN %!SAnalysisFoundCalculated                                                  1                                                                              ##STR41##                                                                         64 red-brownoil 8.5 68.9269.27  9.25                                           9.29 8.047.77 13.7713.66                                                        2                                                                              ##STR42##                                                                        1 96 orange-brownpowder,melting point124-126 8.4 65.7165.75 8.278.25           9.589.47 10.9610.95                                                              3                                                                              ##STR43##                                                                        12  81 orange-brownoil 8.4 71.2471,47  9.96 9.80 6.926.82  7.92 7.98                                                                                  4         ##STR44##                                                                       1  white powder,melting point94 9.2 55.3755.72  4.65 4.81 7.176.97      1      16.426.14                                                                        5                                                                              ##STR45##                                                                        1 61 yellow powder,melting point46-48 9.25 60.7361.18  6.37 6.49               5.905.73 13.5113.46                                                              6                                                                              ##STR46##                                                                        1 76 yellow oil 9.2 65,4965.60  7.90                                            7.95 4.774.97 10.9311.00                                                        7                                                                              ##STR47##                                                                        1 93 yellow resin 10.1 62.1062.35   7.49 7.62 4.534.51 20.7220.55                                                                                  8            ##STR48##                                                                       1 67 orange-yellowoil 10.05 62.1061.97  7.49 7.60 4.534.55 20.7220.61          9                                                                                ##STR49##                                                                       1 48 orange oil 9.6 63.1263.04  7.79                                            7.86 4.334.34 19.8219.32                                                                                            10                                          ##STR50##                                                                       1 62 yellow powder,melting point72-74 10.1 59.8159.86  7.13 7.16               3.673.71 16.8116.59                                                             11                                                                               ##STR51##                                                                       1 53 yellow powder,melting point124-125 10.2 50.8750.83  4.62 4.63             4.944.90 22.6322.83                                                             12                                                                               ##STR52##                                                                        57 yellow oil 8.5 62.1162.36   7.49                                            7.63 4.534.46 10.3610.25                                                                                            13                                          ##STR53##                                                                       12                                                                               21 reddish oil 9.3                                                              14                                                                             ##STR54##                                                                       1 37 yellow oil 7.2 64.4765.94 10.8211.14 7.527.63  8.60                        8.19                                                                                                                                    15                      ##STR55##                                                                       1 65 yellow oil 8.5 46.8147.00  7.37                                            7.52 6.826.79 15.6215.67                                                                                            16                                          ##STR56##                                                                       12  84 yellow resin 9.2 51.9553.01  8.36 8.44 5.054.85 23.1122.39                                                                                 17            ##STR57##                                                                       1 62 orange powder,melting point89-90 9.1 38.2338.15  5.21 5.13                5.575.97 25.5125.61                                                             18                                                                               ##STR58##                                                                       1 62 yellow oil 9.1 50.1249.75  7.51                                            7.48 4.184.23 19.1119.02                                                                                            19                                          ##STR59##                                                                       12  88 yellowish oil 8.3 58.1058.18  9.40 9.33 4.844.77 11.0811.15                                                                                 20           ##STR60##                                                                       12  74 yellow oil 9.1 55.0455.13  8.91 8.96 4.594.54 20.9920.93                                                                                 21              ##STR61##                                                                       12  70 yellow liquid 9.55 69.0269.27 10.9410.85 2.982.82 13.6513.34                                                                                 22          ##STR62##                                                                       12 31 yellow oil 9.5 69.7569.81 9.239.38 3.133.00 14.3213.78                   23                                                                               ##STR63##                                                                       1 65 yellow viscoseoil 9.5broad 67.1967.24 10.9910.83 8.047.92  9.20           9.43                                                                            24                                                                               ##STR64##                                                                       1 75 yellow resin 8.45 67.5567.54 11.0511.27 7.887.73  9.02 9.06                                                                                 25             ##STR65##                                                                       1 79 yellow resin 8.75 68.2468.42 11.1810.83 7.587.56  8.67 8.70                                                                                 26             ##STR66##                                                                       1 88 orange resin 8.4 68.8769.19 11.3011.20 7.307.22  8.36                      8.38                                                                     

EXAMPLE 27 Test for Wear Protection

The suitability as anti-wear additive is tested by the ASTM Standard Method D-2783-81, using the Shell four-ball apparatus. The base oil used is Catenex® P941 made by Shell, to which the quantity, indicated in the table, of compound according to the particular example is added. The following are determined:

a) The weld load WL as the load (in kg) at which the 4 balls weld together within 10 seconds, and

b) the mean wear scar diameter at a load of 40 kg for 1 hour (in mm).

    ______________________________________                                         Compound  Quantity added                                                                             Weld load                                                                               Wear scar diameter                              from Example                                                                             (% by weight)                                                                              (kg)     (mm)                                            ______________________________________                                         1         0.25        --       0.49                                                      1           1800     0.50                                            2         0.25        --       0.51                                                      1           1800     0.51                                            3         0.25        --       0.55                                                      1           1800     0.50                                            4         0.25        --       0.53                                                      1           2000     0.58                                                      2.5         2400     --                                              5         0.25        --       0.53                                                      1           2200     0.53                                                      2.5         2400     --                                              6         0.25        --       0.53                                                      1           2000     0.51                                                      2.5         2400     --                                              7         0.25        --       0.52                                                      1.0         2000     0.56                                                      2.5         2200     --                                              8         0.25        --       0.50                                                      1.0         2000     0.55                                                      2.5         2200     --                                              9         0.25        --       0.52                                                      1.0         2200     0.50                                                      2.5         2400     --                                              10        0.25        --       0.53                                                      1.0         1800     0.56                                            11        0.25        --       0.57                                                      1.0         2200     0.59                                            12        0.25        --       0.48                                                      1.0         2000     0.49                                                      2.5         2000     --                                              13        0.25        --       0.49                                                      1.0         2000     0.54                                                      2.5         2200     --                                              14        0.25                 0.55                                                      1.0         1800     0.57                                            15        0.25        --       0.51                                                      1.0         2200     0.58                                                      2.5         2400     --                                              16        0.25        --       0.56                                                      1.0         2000     0.63                                                      2.5         2400     --                                              17        0.25        --       0.62                                                      1.0         2200     --                                              18        0.25        --       0.58                                                      1.0         2200     0.65                                                      2.5         2800     --                                              19        0.25        --       0.53                                                      1.0         2000     0.57                                                      2.5         2000     --                                              20        0.25        --       0.54                                                      1.0         2000     0.61                                                      2.5         2400     --                                              21        0.25        --       0.67                                                      1.0         1800     0.45                                            22        0.25        --       0.45                                                      1.0         2000     0.50                                                      2.5         2400     --                                              23        0.25        --       1.51                                                      1.0         1800     0.52                                            24        0.25        --       0.53                                                      1.0         1800     0.54                                            25        0.25        --       0.52                                                      1.0         1800     0.53                                            26        0.25        --       0.51                                                      1.0         1800     0.54                                            Reference without additive                                                                           1400     0.70                                            ______________________________________                                    

EXAMPLE 28 Test for Stabilization Against Oxidative Degradation

(TFOUT: Thin Film Oxygen Uptake Test)

This test is a modified form of the rotary bomb test for mineral oils (ASTM D 2272). A detailed description is to be found in C. S. Ku and S. M. Hsu, Lubrication Engineering 40, (1984), pages 75-83. The test oil in this test is a commercial 15W40 engine oil, with about half the usual content of zinc dithiophosphate (0.75% of ZnDTP, 550 ppm of P, 1160 ppm of Zn). The additive under test is tested in the oil for its stabilizing action in the presence of water (2%), an oxidized/nitrated gasoline fraction (4%) and a mixture of liquid metal naphthenates (4%) at 610 kPa oxygen pressure and 160° C. The water and the two liquid catalysts for the test are obtained under the description Standard Reference Material 1817 from the National Bureau of Standards (NBS), with a certificate for the analysis. The test is complete when a marked break in the pressure/time diagram indicates the start of oxidation at the end of the induction period (minutes).

A long induction period means a good stabilizing action of the additive.

    ______________________________________                                         Compound     Quantity added                                                                             Induction period                                      from Example (% by weight)                                                                              (minutes)                                             ______________________________________                                         5            0.5         107                                                   6            0.5         109                                                   7            0.5         123                                                   9            0.5         126                                                   15           0.5         117                                                   16           0.5         129                                                   Reference    without additive                                                                            83                                                   ______________________________________                                     

What is claimed is:
 1. A compound of the formula II ##STR67## in which x=1 or 2, R² is as defined for --OR⁶ or --SR⁷ and,if x=1, R is as defined for R¹ or R³ --O--, and R¹ is alkyl having 1 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ring C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₅ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, alkenyl having 2 to 18 C atoms, phenyl, naphthyl, C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl, or R³ is alkyl having 9 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ring C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₅ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, alkenyl having 5 to 18 C atoms, C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl, or R¹ and R³ are alkyl having 1 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ting C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₅ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, alkenyl having 2 to 18 C atoms, phenyl, naphthyl, C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl, each of which are monosubstituted or polysubstituted by groups from the series comprising halogen, cyano, nitro, --OR^(a) or --COOR^(b), or R¹ and R³ are alkyl having 2 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 3 to 10 ting C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₃ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, alkenyl having 3 to 18 C atoms, C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl, each of which are interrupted by a group selected from --O--, --S--, --NH--, ##STR68## C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl being interrupted only in the alkyl radicals, or R¹ and R³ are alkyl having 2 to 25 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 3 to 10 C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₃ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, alkenyl having 3 to 18 C atoms, C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl, each of which are monosubstituted or polysubstituted by groups from the series comprising halogen, cyano, nitro, --OR^(a) or --COOR^(b) and interrupted by a group selected from --O--, --S--, --NH--, ##STR69## C₇ -C₁₈ aralkyl or C₇ -C₁₈ alkaryl being interrupted only in the alkyl radicals, R^(a) being as defined for R³ with the exception of --OR^(a) and R^(b) being alkyl having 1 to 18 C atoms or alkyl having 2 to 20 C atoms and interrupted by a group selected from --O--, --S--, --NH--, ##STR70## or an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ring C atoms or phenyl, naphthyl, C₇ -C₁₈ alkaryl or C₇ -C₁₈ aralkyl, and R⁶ and R⁷ are alkyl having 11 to 18 C atoms or alkyl having 2 to 20 C atoms and interrupted by one or more groups from the series comprising --O--, --S--, --NH--, ##STR71## or an unsubstituted or C₁ -C₈ alkyl-substituted cycloalkyl group having 5 to 12 ring C atoms, an unsubstituted or C₁ -C₈ alkyl-substituted C₅ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group, an unsubstituted or C₁ -C₈ alkyl-substituted C₃ -C₁₂ cycloalkyl-C₁ -C₄ alkyl group interrupted by a group selected from --O--, --S--, --NH--, ##STR72## C₇ -C₁₈ aralkyl, wherein R⁷ is also C₇ -C₁₈ alkaryl or, if x=2, R is as defined for R⁸ and R⁸ is alkylene having 1 to 18 C atoms alkylene having 2 to 18 C atoms and interrupted by at least one --O-- group, alkylidene having 2 to 20 C atoms or alkylidene having 3 to 20 C atoms and interrupted by at least one --O-- group.
 2. A compound according to claim 1, of the formula IIa ##STR73##
 3. A compound according to claim 2, in which R is as defined for R¹ or --O--R³ and R¹ is phenyl or alkyl having 1 to 18 C atoms and R³ is alkyl having 10 to 18 C atoms or phenyl and R² is --SR⁷.
 4. A compound according to claim 3, in which R⁷ is alkyl having 12 to 18 C atoms, --CH₂ --COO--C₁ -C₁₈ alkyl or phenyl-C₁ -C₄ alkyl.
 5. A compound according to claim 1, of the formula IIc ##STR74## 